6. Which Bluetooth codecs can the BTR1K support? And what are the corresponding indicator colors for each Bluetooth codec?

A: The BTR1K can support aptX, aptX-LL, AAC, and SBC.

Here is the indicator color for the above four Bluetooth codec:
SBC: Blue （The blue light pulses when when playing songs without being charged; the blue light stays steadily on when playing songs while being charged.）
AAC: Cyan（The purple light pulses when when playing songs without being charged; the purple light stays steadily on when playing songs while being charged.）

aptX: Purple（The purple light pulses when when playing songs without being charged; the purple light stays steadily on when playing songs while being charged.）

aptX-LL: Purple（The purple light pulses when when playing songs without being charged; the purple light stays steadily on when playing songs while being charged.）

Note: The red light indicates the current working status when it is low battery condition.